Growth Promotion in Pea Stem Sections. <i>I.</i> Stimulation of Auxin and Gibberellin Action by Alkyl Lipids

Stowe, Bruce B.

doi:10.1104/pp.35.2.262

Cited by 49 publications

(21 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As Weber, Gloor, and Wiss have pointedl out (24), the activation of mitochondrial cytochronme systems requires a hydrocarbon chain within certain length limitations. This is compatible w-ith our data indicating that it is the isoprenoid moiety of vitamins K1 and E that is effective in increasing stenm section growth, and with the earlier results (21) indlicating that fatty acid esters equal to or greater than C12 chain length couldl so act. Presumably then, these compounds must fit into some lipid-requiring matrix, probably in the mitochrondrion.…”

Section: Methodssupporting

confidence: 81%

“…The dwarf variety Laxton's Progress was used initially, but its decreasing availability made it necessary to substitute a similar strain, Progress Numiiber Nine, in later experiments. Stabilized emulsions of fat-soluble substances were prepared as lescribed earlier (21) (6). The activity of all these fats is essentially the same as that of other alkyl lipids studied earlier.…”

Section: Methodsmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Growth Promotion in Pea Stem Sections. II. By Natural Oils & Isoprenoid Vitamins

Stowe

Obreiter²

1962

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

The elongation of pea stem sections brought about by indoleacetic acid (IAA) and gibberellic acid (GA3) can be increased considerably by trace quantities of a large number of fatty acid esters and chemically related compounds (19,21). The emulsifying teclhnique used for these alkyl lipids has permitted the studv of the effect of some natural oils and of fatsoluble vitamins on pea stem section growth for the first time. In this paper it is shown that vitamins K, and E, and some related isoprenoid compounds, are like the alkyl lipids studied earlier in that they stimiiulate pea section growth in a similar manner adI (l0o so at even lower concentrations. No simple theor-y has yet been found adequate to explain this effect, but the results are compatible with the earlier suggestion (20,23)

show abstract

Section: Methodssupporting

confidence: 81%

Section: Methodsmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 1 more Smart Citation

Growth Promotion in Pea Stem Sections. II. By Natural Oils & Isoprenoid Vitamins

Stowe

Obreiter²

1962

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among al,kyl nitriles, the 14 carbon chain was appreciably less active than the 15, reminiscent of our results with fatty acid esters whose activity waned at a 12 carbon chain (31). But since the methyl ester moiety must be added, the actual lengtlh of both mvristonitrile and methyl laurate is nearly the same, namely about 20 A (33).…”

Section: Discussionsupporting

confidence: 61%

“…Natural compounds which are physiologically active include such substances as triglycerides, a-tocopherol, vitamin K1, and phytol (32). Representative synthetic substances which also are active in the bioassay include methyl oleate, some Tween detergents, and monoolein (31). Small In this paper, our previous report that palmitonitrile is active in the bioassay is extended to other simple nitriles, and alkyl acetylenes also are shown to be active.…”

mentioning

confidence: 97%

Growth Promotion in Pea Stem Sections. III. By Alkyl Nitriles, Alkyl Acetylenes and Insect Juvenile Hormones

Stowe¹,

Hudson²

1969

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

Abstract. C,4, C15, and C16 alkyl nitriles, and C16 and C18 alkyl acetylenes at 10 to 105 micromolar concentrations promote the growth of stem sections from red-light-exposed seedlings of dwarf peas (Pisum sativum L. cv. Progress No. 9). Similar results were obtained with substances active as insect juvenile hormones, namely farnesol, the racemic ethyl ester of 1 of the natural hormones, -and a "synthetic juvenile hormone" mixture, the latter 2 having as high an activity in the pea assay as any lipid reported previously. A sterically nearly idenitical compound, methyl-RS-10,11-epoxyfarnesoate, is a weak insect hormone and did not promote plant growth. Thus activity in peas and in insects is in some cases parallel. Other similarities and some differences are discussed. Peas appear to require molecules longer than 20A, while insect activity is maximal at that length. All active molecules are ineffective in promoting pea stem elongation by themselves, indole acetic acid must also be present. The lipid effect in plants and the juvenile hormone response in insects have much in common and the evidence suggests they could have a similar locus of action in a membrane controlling respiratory function. In this paper, our previous report that palmitonitrile is active in the bioassay is extended to other simple nitriles, and alkyl acetylenes also are shown to be active. In addition, the racemate of the ethyl ester of one of the natural insect juvenile hormones, as well as a synthetic mixture with juvenile hormone activity, are shown to be highly effective in promoting growth of pea stem sections. Materials and MethodsThe bioassay used has been described previously (32). Brieflv, 10 mm sections cut from just below the apex of 7 day old seedlings of dwarf peas (Pisum satizvum L. cv. Progress No. 9) which were grown at 250 under continuous extremely weak red light, are randomized and floated, 10 to a Petri dish, on 20 ml of 1.5 % sucrose solution buffered with 5 mM KH2PO, (pH 5.5)

show abstract

The Changing Concept of Auxin

Kefford

Goldacre

1961

American J of Botany

View full text Add to dashboard Cite

Kefford, N. P., and P. L. Goldacre. (Division of Plant Industry, C.S.I.R.O., Canberra, Australia.) The changing concept of auxin. Amer. Jour. Bot. 48(7): 643–650. Illus. 1961.—Recent findings in auxin research are interpreted as follows: The concept of auxin as only a cell‐enlargement regulator can no longer accommodate the variety of growth phenomena controlled by auxin. In isolated tissues, auxin interacts with gibberellin in the control of cell enlargement, and auxin and kinin interact in initiating cell division. Some evidence suggests a single site of auxin action for both processes. It is proposed that auxin is not a determining agent but a predisposing agent, causing the production of something in limiting amount which is required in both processes —in the presence of kinin, cell division is activated; in the presence of gibberellin, cell enlargement is activated. In the presence of limiting amounts of auxin, there could be competition between the 2 processes, the outcome depending on the balance of kinin and gibberellin. The possibility of competition in the presence of supraoptimal auxin concentrations is also suggested. Difficulties arise in the application of this concept to observations on intact plants, where cause and effect relationships are not readily established; the use of excised plant parts shows the relationships more clearly. The role of auxin in cell and organ differentiation is also discussed. The primary auxin reaction is not yet known. The biological assay for auxins is discussed with reference to this and to natural auxins. The function of auxin in the correlation of tissue and organ growth through the auxin transport system is stressed, and it is pointed out that if transport is a necessary requirement of a native auxin, indole‐3‐acetic acid is at present the only substance known to qualify.

show abstract

Growth Promotion in Pea Stem Sections. I. Stimulation of Auxin and Gibberellin Action by Alkyl Lipids

Cited by 49 publications

References 20 publications

Growth Promotion in Pea Stem Sections. II. By Natural Oils & Isoprenoid Vitamins

Growth Promotion in Pea Stem Sections. II. By Natural Oils & Isoprenoid Vitamins

Growth Promotion in Pea Stem Sections. III. By Alkyl Nitriles, Alkyl Acetylenes and Insect Juvenile Hormones

The Changing Concept of Auxin

Contact Info

Product

Resources

About